Sennheiser HD25-1 II Review


Sennheiser HD25

Sennheiser HD25-1 ii closed back headphones are very popular with DJ’s and studio workers

This is a Sennheiser HD25-1 II Review. The Sennheiser HD 25 1 II closed back headphones are not new. They were first launched by Sennheiser in 1988, more than 25 years ago. There’s a reason why they have stayed on the market for so long. People keep buying them because they live up to their reputation as some of the best DJ headphones that can be found at their price.

The Sennheiser hd 25 was first marketed was first marketed to professionals in the film and TV industry. Today they are very popular with TV news anchors, and with many other profession like DJ’s and recording artists who have recognized their value as some of the best studio monitor headphones and cheap DJ style headphones that are available to the public.

The HD25 is not just for professionals. It is reasonably priced for the budget of most home users who want a good set of cheap studio headphones for their own personal use. is compatible with DVD and CD players, with iPod and with MP3 players. You can plug them into any listening device that will accept a 1/8 inch (3.5mm) jack plug, including your computer, tablet, Blackberry Playbook or moble phone (for listening only, since the Sennheiser hd 25 1 headphones have no microphone). The included 1/4 adapter makes it compatible with larger desktop devices like home stereos and studio or recording equipment.

Sennheiser HD25

What Are The Different Varieties Are Of The HD25 DJ Headphones?

Several Sennheiser headphones and headsets are available which are actually variations of the original HD 25 edition. In fact, other companies have seen the success of the HD25 Sennheiser headphones and have copied or imitated some of the features into their own products. Though the basic design and quality is all the same, different varieties of the HD25 have different features, and they all have different prices. Here are some of the available variations:


Sennheiser HD 25 1 II

After the origional Sennheiser headphones HD 25 had been out for a while, some improvements were made and perfected into the Sennheiser HD25-1 II Closed-Back Headphones headphones which are available today. These are the most common variety, and also the cheapest. At the time of this review they cost just under $200 on Amazon, and they get a rating of about 4.5 stars out of 5 on Amazon. They are for general purpose listening and have no microphone or remote.


Sennheiser Adidas HD 25

Sennheiser HD25-1 II - 3The Sennheiser HD 25 Adidas is a set of cool looking DJ headphones which in just about every way is the same as the HD 25 1-ii. The only essential differences are the price and the color. Instead of the normal black colour, these come with deep blue ear pads and blue headband pads and with a little bit of blue decoration on the outside of each ear cup. At one time you could get white padding instead of blue. This site is not aware if white padding is still available. At the time of this review, the Adidas gets a grade of 4.3 stars out of 5, and sells for about $410 on Amazon.


Sennheiser HD 25 Aluminum

The Sennheiser sealed model HD 25 ALUMINIUM (Japan Import) came out in the 25th anniversary of the HD 25’s as a replacement of the Amperior headphones. At the time of this review, the Aluminum HD 25 gets a score of about 4.5 stars out of 5, and they cost about $500. Like the Amperior, these have a solid, thick back on each ear cup. Most say they prefer the sound of the Aluminum variety, perhaps because they use the 70 ohm impedance drivers instead of the 18 ohm drivers as in the Amperior series. Unfortunately, these do not have the on-cable microphone and remote like the Amperior model.


Sennheiser Amperior Headphones

Sennheiser HD 25 - AmpThe Amperior Headset is available in either silver or blue. At the time of this review, the Amperior gets a grade of 4.5 stars out of 5, and costs about $270 on Amazon. This variety has been discontinued, but there are still a few of them around for purchase. Instead of the plastic back on each ear cup, these have a very rigid, thick aluminum back which greatly reduces the distortion caused by the mechanical vibrations of the drivers. It also has extra microfiber damping pads on the back earcup (in adition to the felt lining in the back of the ear cups of all HD25’s) for even better sound isolation.

Most important, the Amperior comes with two connecting cables instead of just one. Instead of the double steel cable which the other HD 25 headphones use, this is a thick, single strand removable cord. The other cable has an in-line microphone and remote, optimized for Apple products like the iPhone, iPod and the iPad. The remote allows the user to control volume, answer or drop phone calls, stop, play, pause, and change sound tracks.

Another important difference is that it comes with 18 ohm impedance drivers instead of the 70 ohm impedance that other varieties of the HD 25 have. The lower impedance makes it easier to get good volume from low-powered mobile devices like cell phones and MP3 players.


Uber Modded HD25 1 II

Sennheiser HD25 UberThis is something you can’t get by shopping on Amazon. A British company named Custom Cans customizes and improves several differet headphone models. One of the DJ headphones that they customizes is the HD25. When you go to their website you can choose from a wide selection of artistic designs. But besides the appearance there are also several structure changes which greatly improve sound quality.

The HD25 comes from the factory with a felt disk behind the driver dampen vibrations. In the Uber Modded HD 25, the felt disk is replaced with a “rattlemat,” and in the back of the diaphragm enclosure they cover half of the bassports. The result is to reduce some of the mechanical vibrations and absorb distortion and noise.

The second thing they do is add lead weight around the diaphragm casting and to the back of the drivers. This makes the structure more rigid and efficient so that less of the energy is wasted in rattling the housing, and more of the energy is turned into sound.

They also change the cable. Sennheiser uses a steel double cable for extra strength. Custom cans replaces the steel cable with a teflon-coated, hand-braided, silver plated copper cord. The steel cable from Sennheiser has about 4 ohms of resistance. The replacement cable lowers the resistance to almost nothing.

The result is a much improved sound quality. Mechanical distortion is greatly reduced. Volume increases somewhat because of the reduced resistance, damping is improved, and there is more sound in the bass tones. The Uber mod is about 50 grams heavier than the standard HD 25.


What Do The HD 25 1 II headphones Sound Like?

Since the Sennheiser HD25 is designed for professional use, the tones are fairly well balanced over the entire frequence response range. That is why these are classified as reference headphones. This is not the headphone you’re looking for if you want a strong bass emphasis. Though the tones are, for the most part, well balanced, the highest pitches are extra bright and a bit excited.

Sound may differ somewhat in the different varieties of the HD25, but they all have a frequency response range of 16 – 22,000 hertz. Since normal, good human hearing ranges from about 10 herts to 22,000 hertz, this includes all but the very lowest tones that the human ear can hear. The maximum sound pressure level is about 120 dB, with a rated load of about 200 mW. Sound distortion is less than 0.3%, and is even less than that in some of the more rigid varieties. Users say that they detect no distortion in the highest pitches.


What Are The Specifications Of The HD 25 Sennheiser Headphones?

Although some of the qualities of the HD25 Sennheiser may very slightly among the different varieties, the specifications of the basic HD25 1 II model are as follows:

Sennheiser HD 25 - HFH

      • 16 hertz – 22,000 hertz frequency response range
      • 200 mW rated load capacity
      • 120 dB maximum sound pressure level
      • 70 ohms impedance
      • Less than 0.3% total harmonic distortion
      • Basically balanced tones throughout frequency range
      • 5 foot (1.5 Meter) connecting cable
      • 5.7 ounces (140 grams) total weight
      • 2 year limited warranty

Sennheiser HD25

What Features Of the HD 25 1 II Make It Special For DJ’s And Other Professionals?

The Sennheiser HD25 is great for personal use, and many people use it around the house, but it was designed with special quality for professional use. There are many features which make these headphnes popular with professionals like recording artists and news anchors and DJ’s. In fact, several web sites have listed these among the top 10 best DJ headphones of 2014. Some of the features which make them popular as professional studio quality headphones are the following:


Split Headband

SEN - 2Headphones that fall off or don’t stay in place can be very annoying, especially when you’re trying to work. Traditional over-head headphones typically have a problem of falling off when you bend over or even just look down.

HD 25 Sennheiser headphones have a split headband that you can spread apart. Many other companies have copied this design from the HD 25 since it first came out more than 25 years ago, and the reason why so many have copied the design is because it works so well. The moving hinge on each side lets you adjust the divided headband as you please. Even those who use the HD 25 for running headphones say that the split headband keeps them firmly in place.

Not only does the split headband keep the headphones anchored firmly in place, it divides the weight between two areas as they rest on your head. You can choose for yourself what positions works best and is the most comfortable for you. Under each side of the divided headband is a foam pad to make the headphones more comfortable during long listening sessions.


Rotating Ear Cup

ss.SENH25.hfh.47Sometimes those who do studio work need to be able to hear what’s going on around them at the same time that they are listening to their headphones. At other times it is best to block out the outside noises with good sound isolation. With the HD 25 you can have either one. The left ear cup has a hinge that lets the listener rotate it up and out of the way for one-ear listening.

Besides being a useful for professionals, this can be an important safety feature for joggers who want to be aware of potential dangers around them when they are outside on the road. It can also be practical for a mom or a dad at home who needs to be aware of the needs of small children while he or she enjoys listening to music.


Replaceable Parts

Every part on the HD 25 is replaceable. You can even completely dismantle the headphones without a screwdriver or any tools at all. All the parts just snap apart and snap back togethr again. That can be important for a professional who needs to make a repair or a modification on the spot at work or out in the field. The replaceable part feature also adds to the longevity and useful life of the product. If the connecting cable or any other part is damaged or worn out, you don’t have to throw away the whole set. Just order a replacement for the damaged part.


Sound Isolation

ss.SENH25.hfh.38Users of the HD25 headphones commonly agree that its degree of noise isolation is outstanding. Virtually no sound from the outside will penetrate, and your headphone sounds will not bleed out to annoy those around you.

Near perfect sound isolation is accomplished by three factors. First, the headphones use a closed-back design. Without closed ear cups headphones cannot be soundproof. Some complain that closed-back ear cups make the sound less natural, but this is partially mitigated by the damping properties of the insulating materials.

Second, the soft foam ear pads absorb and block much of the noise from the outside. The headphones come with two sets of ear cushions. The fabric velour pads are very good for sound isolation, and the pleather pads are even better.

The split headband keeps the ear cups clamped tightly to the ears. This does a lot to help the noise insolation properties, but many complain that it also makes the headphones uncomfortable to wear.


Are The HD 25 Headphones Comfortable To Wear?

Some professionals must use their headphones all day long, so Sennheiser has built in several comfort features to make the experience more enjoyable during long listening sessions.

However, not everyone agrees that the comfort features are effective. The biggest complaint is that the headband clamps the ear cups so tightly over the ears that after a while they become too uncomfortable to bear.

One user says that he effectively solved the problem of the too-tight ear cups by spreading the headphones over a basketball overnight. Eventually most listeners can get use to the pressure on the ears.


Soft Foam Ear Cup Pads

ss.SENH25.hfh.40The HD 25 comes with two sets of interchangeable pads for the ear cups. One is covered with a vinyl pleather (or p-leather) material. The other is covered with a fabric velour material. Both are filled with very soft foam. Most users agree that the fabric velour pads are more comfortable, but they say that the pleather pads give better sound isolation.


Light Weight

The HD 25 weighs only 5.7 ounces (140 grams) without the cable. This is ridiculously light for such a powerful set of over-head noise isolation headphones. This is accomplished, in part, by its on-ear, supra aural design which allows for much smaller ear cups. Many noise isolation headphones use the over-ear (circum aural) design which takes most of the pressure off the ears, but also adds a lot of weight. The durable plastic material also contributes much to the light weight construction.


Padded Headband

Each side of the divided headband has a foam cushion to protect the crown of the users head. Since the split headband allows for a custom adjustment, the already ultra-light weight of the headphones can be evenly spread out over the head. The foam cushions can be removed or replaced if necessary.


How Durable Is The HD 25 1 II?

Sometimes professionals put their headphones through a lot of abuse and wear, so these headphones are made to be able to take a lot of punishment and abuse. Although the Sennheiser HD25 is made almost completely of plastic, the plastic is very strong, flexible, and scratch resistant. To reduce the danger of damaging the connecting cord, the cable is made of strong, break-resistant steel instead of the usual copper.


What Do The HD 25 1 II Headphone Reviews Say?

These headphones earn a very good grade of about 4.5 stars out of 5 in Amazon, and they have a very good reputation that has held up well over the years. But they don’t get a perfect score. There are some complaints, and some users and owners are dissatisfied with their purchase.


Satisfied Because…

ss.SENH25.hfh.36Almost everyone agrees that the sound quality of these headphones is outstanding as advertized, even if they dislike the headphones for other reasons. The headphones don’t have a strong, emphasized bass, but they weren’t made for that. They were designed for professionals who need a good balance of tones across the frequency spectrum, and most reviewers say that that’s what they deliver.

These headphones get high marks among reviewers for excellent sound isolation, even in very noisy situations. Outside sound has to be quite loud to penetrate.

Although all reviewers seem to agree that the HD 25 is exceptionally light, comfort is not one of the strong points of this headphone because of the strong clamping pressure on the ears. However, some reviewers say that after a while the headband seemed to stretch out a bit, and they were able to get use to the tension. One user said that he resolved the tension problem of uncomfortable pressure by stretching the headphones out over a basketball over night.

Durability is another strong point. Several reviewers have said that the headphones looked flimsy at first, but the users were later surprised at how much abuse the headphones could take without breaking. And since parts are replaceable, they are expected to last for a long time. One user says that he has been using his for about 10 years.


Dissatisfied Because…

Among those who are disappointed with the HD 25 headphones, the most common complaint is that they are just too uncomfortable, especially if the user wears glasses. Great sound doesn’t help if you can’t wear them without them hurt. Some users have been able to get use to them, but some haven’t.

A few reviewers say that they have received defective units. Some arrived defective, and some lost sound in one or both ear cups after being used for a short while. Reports of defective units are very rare, but make sure you keep the box and the receipts all safe, just in case you need to use the 2 year warranty.

Almost everyone agrees that the sound isolation is very good with these headphones. But not everyone agrees. Occasionally a reviewer says that the noise isolation was not as good as he had hoped.


Sennheiser HD25

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